I have the plans for the half long pipes from the Cocks and Bryan book, but the drawing of the chanter is missing a key piece of information, that being the throat diameter of the bore. The drawings only give me the diameter of the widest portion at the bell of the chanter. Does anyone have more complete bore data for the chanter that was measured in the book? Or are there any other plans out there for a border pipe chanter that plays in approximately A440?